WO2019244618A1

WO2019244618A1 - Working vehicle

Info

Publication number: WO2019244618A1
Application number: PCT/JP2019/022122
Authority: WO
Inventors: 孝弘原田
Original assignee: ヤンマー株式会社
Priority date: 2018-06-22
Filing date: 2019-06-04
Publication date: 2019-12-26
Also published as: EP3812516A4; CN112105783A; JP2019218810A; US20210262193A1; KR20210023812A; EP3812516A1; JP7145657B2

Abstract

A working vehicle 1 has an upper rotating body 9 and a lower traveling body 2. The lower traveling body 2 is provided with: a center frame 26 on which a swivel joint 25 is vertically mounted; a right side frame 27R on which a right traveling motor 22R is mounted; a left side frame 27L on which a left traveling motor 22L is mounted; at least one right restriction member 3R and at least one left restriction member 3L, which restrict the maximum width of the vehicle; a right hose guide section 5R having a right opening 51R into which a right hydraulic hose 251R is inserted, and provided to the right restriction member 3R; and a left hose guide section 3L having a left opening 51L into which a left hydraulic hose 251L is inserted, and provided to the left restriction member 3L.

Description

Work vehicle

The present invention relates to a work vehicle, for example, to a work vehicle of a crawler type traveling capable of changing a vehicle width.

Patent Literature 1 discloses a mini-excavator including a lower traveling body having left and right side frames capable of changing the vehicle width, in which first and second hydraulic hose groups connected to a left and right traveling device from a center joint are restrained from dispersing. First, a piping structure of a hydraulic hose provided with a second restraining member is disclosed.

Patent Document 2 discloses a construction machine having left and right side frames capable of changing the vehicle width on a lower traveling body, in which first and second hydraulic hose groups connected to a left and right traveling device from a center joint are arranged along the outer peripheral surface of the center joint. The first and second hydraulic hose groups are expanded or contracted in the space formed between the outer peripheral surface of the center joint and the inner peripheral surface of the circular cylinder in which the center joint is disposed inside. This discloses a hydraulic hose piping structure capable of changing the vehicle width without causing excessive bending of the first and second hydraulic hose groups.

JP 2014-202009 A JP 2013-129997 A

However, with the hydraulic hose piping structure of Patent Document 1, when the width between the left and right side frames is contracted, the first and second hydraulic hoses are bent and protrude from the lower traveling body, There is a concern that the hydraulic hose may be damaged by contact with falling objects or obstacles.

In addition, in the hydraulic hose piping structure of Patent Document 2, since the hydraulic hose is curved and circulated along the outer peripheral surface of the center joint, the cost increases because the total length of the hydraulic hose is increased.

In view of the above problems, the present invention provides a work vehicle having a hydraulic hose piping structure that can design a hydraulic hose to a minimum necessary length and that can restrict free movement of the hydraulic hose without forcibly bending the hydraulic hose. The purpose is to provide.

The work vehicle of the present invention is a work vehicle having an upper revolving unit and a lower traveling unit that supports the upper revolving unit in a freely rotatable manner.
The lower traveling body is
A center frame on which a swivel joint to which one end of each of the right hydraulic hose and the left hydraulic hose is connected is suspended,
A right side frame to which a right running motor is mounted, to which the other end of the right hydraulic hose is connected, and a left running motor to which the other end of the left hydraulic hose is connected. The left side frame on which is mounted,
At least one right regulating member extending from the right side frame toward the left side frame, regulating a maximum vehicle width at which an interval between the right side frame and the left side frame is maximum; and At least one left regulating member extending from the side frame toward the right side frame,
A right hose guide portion having a right opening through which the right hydraulic hose is inserted, and provided in the right regulating member;
A left opening through which the left hydraulic hose is inserted, and a left hose guide provided on the left regulating member.

The lower traveling body is
A rear lateral support frame provided on the rear upper surface of the center frame behind the swivel joint,
A rear right connecting portion extending from the right side frame toward the left side frame and slidably inserted on the right side of the rear lateral supporting frame; and a rear right connecting portion facing the rear right connecting portion; A rear left connecting portion extending from a side frame toward the right side frame and slidably inserted on the left side of the rear lateral support frame;
A front lateral support frame provided on a front upper surface of the center frame so as to be opposed to the rear lateral support frame with the swivel joint interposed therebetween,
A front right connecting portion extending from the right side frame toward the left side frame and slidably inserted into the right side of the front lateral support frame; and a front right connecting portion facing the front right connecting portion; A front left connecting portion extending from a side frame toward the right side frame and slidably inserted into a left side of the front lateral support frame.

The lower traveling body is
The upper surface of the center frame may further include a hose route portion having a space for guiding the right and left hydraulic hoses from the swivel joint to the right and left hydraulic motors.

The hose route portion includes a right rear guide portion having a right rear opening through which the right hydraulic hose is inserted closer to the right hydraulic motor side than the right hose guide portion, and / or the left rear portion relative to the left hose guide portion. A left rear guide portion having a left rear opening through which the left hydraulic hose is inserted may be further provided on the hydraulic motor side.

The hose route section has a right front guide section having a right front opening through which the right hydraulic hose is inserted closer to the swivel joint side than the right hose guide section, and / or the swivel joint is larger than the left hose guide section. A left front guide portion having a left front opening through which the left hydraulic hose is inserted may be further provided.

According to the present invention, the hydraulic hose can be designed to have a minimum necessary length.
Further, according to the present invention, it is possible to restrict the free movement of the hydraulic hose without forcibly bending the hydraulic hose.

The left side perspective view showing the work vehicle concerning this embodiment. The top view which shows the piping structure of the hydraulic hose of minimum vehicle width. The perspective view showing the piping structure of the hydraulic hose of the minimum vehicle width. The top view which shows the piping structure of the hydraulic hose of the maximum vehicle width. The perspective view showing the piping structure of the hydraulic hose of the maximum vehicle width. FIG. 3C is a partially enlarged view of the piping structure of the hydraulic hose according to FIG. 3B.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. A backhoe will be described as an example of the work vehicle according to the present embodiment. However, the working vehicle is not limited to the backhoe, and may be another vehicle such as a wheel loader. In the drawings, the traveling direction of the vehicle is indicated by “front” and “rear”, the width direction of the vehicle is indicated by “left” and “right”, and the height direction of the vehicle is indicated by “up” and “down”. When indicating the arrangement, “front” means before the forward direction, and “rear” means after the forward direction. “Right” refers to “right” and refers to the right in the width direction of the vehicle, and “left” refers to “front” and refers to left in the width direction of the vehicle.

FIG. 1 is a left side perspective view of the backhoe 1, and a schematic configuration of the backhoe 1 will be described. The backhoe 1 includes a lower traveling unit 2, a working machine 8, and an upper revolving unit 9.

The lower traveling unit 2 is driven by receiving power from the engine 92 installed on the upper revolving unit 9, and causes the backhoe 1 to travel. The lower traveling body 2 includes right and

left crawlers

21R and 21L and a pair of right and left traveling

motors

22R and 22L. The right and left traveling

motors

22R and 22L, which are hydraulic motors, drive the right and

left crawlers

21R and 21L, respectively, so that the backhoe 1 can move forward and backward. Further, the lower traveling body 2 is provided with a blade 23 in a forward direction and a blade cylinder 24 which is a hydraulic actuator for rotating the blade 23 in a vertical direction.

The work machine 8 is driven by receiving power from the engine 92 to perform excavation work for earth and sand. The work machine 8 includes a boom 81, an arm 82, and a bucket 83, and enables the excavation work by independently driving them.

The boom 81 has its base end rotatably supported by the front part of the upper swing body 9 so as to be vertically rotatable, and is rotated by a boom cylinder 81a that is movable in a stretchable manner. The arm 82 has its base end supported by the distal end of the boom 81, and is rotated by an arm cylinder 82a that is movable in a stretchable manner. The bucket 83 is supported by the distal end of the arm 82 at the base end, and is rotated by a bucket cylinder 83a which is movable in a retractable manner. The boom cylinder 81a, the arm cylinder 82a, and the bucket cylinder 83a correspond to a hydraulic actuator that drives a working unit. An articulated structure is formed by the boom 81 and the arm 82, and the boom 81 is arranged at the most proximal side of the elements constituting the articulated structure.

The upper revolving superstructure 9 includes a control unit 91, an engine 92, a revolving base 93, a revolving motor 94, a canopy 96, and the like. The upper revolving superstructure 9 is revolved by the revolving motor 94 which is a hydraulic motor driving the revolving table 93. Further, a plurality of hydraulic pumps (not shown in FIG. 1) driven by the engine 92 are disposed on the upper swing body 9. These hydraulic pumps supply hydraulic oil to the boom cylinder 81a, the arm cylinder 82a, and the bucket cylinder 83a. The hydraulic pump supplies hydraulic oil to the swivel joint 25 of the lower traveling body 2 and is connected to the swivel joint 25 by each hydraulic hose (front hydraulic hose 253, right hydraulic hose 251R, left hydraulic hose 251L). The cylinder 24, the right running motor 22R, and the left running motor 22L are driven.

[Basic Configuration of Undercarriage 2]

2A and 2B are diagrams showing a piping structure of a hydraulic hose having a minimum vehicle width, and FIGS. 3A and 3B are diagrams showing a piping structure of a hydraulic hose having a maximum vehicle width. FIG. 3C is an enlarged view of a part of a piping structure of a hydraulic hose having a maximum vehicle width. The basic configuration of the lower traveling structure 2 will be described with reference to these drawings.
The center frame 26 located at the center of the lower traveling body 2 has a swivel joint 25 suspended from the front in the center in the width direction.
The swivel joint 25 constitutes a hydraulic line therein and has a plurality of inlet joints for receiving hydraulic oil from a plurality of hydraulic pumps driven by the engine 92. Further, the swivel joint 25 has a plurality of outlet joints for supplying hydraulic oil to the right traveling motor 22R and the left traveling motor 22L, and one end of each of the plurality of right hydraulic hoses 251R and the plurality of left hydraulic hoses 251L. Is connected to the outlet joint.

右 A right side frame 27R and a left side frame 27L are arranged symmetrically to the sides of the center frame 26. A right traveling motor 22R to which the other end of the right hydraulic hose 251R is connected is mounted at a position rearward of the right side frame 27R. A left traveling motor 22L to which the other end of the left hydraulic hose 251L is connected is mounted at a position rearward of the left side frame 27L.

The rear lateral support frame 261 is welded to the rear upper surface of the center frame 26 behind the swivel joint 25.
The rear right connecting portion 261R extends from the right side frame 27R toward the left side frame 27L, and is slidably inserted into the right side of the inside of the rear lateral supporting frame 261.
The rear left connecting portion 261L is opposed to the rear right connecting portion 261R with an interval, extends from the left side frame 27L toward the right side frame 27R, and is slidable to the left inside the rear lateral support frame 261. Is inserted.
The front lateral support frame 262 is welded to the front upper surface of the center frame 26 so as to face the rear lateral support frame 261 with the swivel joint 25 interposed therebetween.
The front right connecting portion 262R extends from the right side frame 27R toward the left side frame 27L, and is slidably inserted into the right side of the inner space of the front lateral support frame 262.
The front left connecting portion 262L is opposed to the front right connecting portion 262R with a space therebetween, extends from the left side frame 27L toward the right side frame 27R, and is slidable to the left inside the front lateral support frame 262. Is inserted.
An expansion / contraction hydraulic cylinder 263 is arranged in parallel with the width direction on the center frame 26 in front of the rear lateral support frame 261, and its right link portion 263 R is on the right side frame 27 R, and the left link portion 263 L is on the left side frame 27 L. Welded.

[Regulation member]
The rear right regulating member 3R is rod-shaped, and its fixed end 31R is fixed to a right erected portion 271R erected from the inner side surface of the right side frame 27R by fixing means, and the right side frame from the center of the rear lateral support frame 261. It is slidably inserted into the through hole 321R of the rear right limit portion 32R erected on the 27R side, and protrudes toward the left side frame 27L. The tip of the rear right regulating member 3R on the left side frame 27L side has a stopper 33R having a diameter larger than the through hole 321R.
The rear left regulating member 3L has a rod shape, and its fixed end 31L is fixed to a left standing portion 271L standing from the inner surface of the left side frame 27L by a fixing means, and a left side frame from the center of the rear lateral supporting frame 261. It is slidably inserted into the through hole 321L of the rear left limit portion 32L provided upright on the 27L side, and protrudes toward the right side frame 27R. A tip of the rear left regulating member 3L on the right side frame 27R side has a stopper 33L having a diameter larger than that of the through hole 321L.

The front right regulating member 4R is rod-shaped, and its fixed end 41R is fixed to a right standing portion 271R standing upright from the inner surface of the right side frame 27R by fixing means, and the right side frame from the center of the front lateral supporting frame 262. It is slidably inserted into the through hole 421R of the front right restricting portion 42R erected on the 27R side, and protrudes toward the left side frame 27L. The front end of the front right regulating member 4R on the left side frame 27L side has a stopper 43R having a diameter larger than that of the through hole 421R.
The front left regulating member 4L has a rod shape, and its fixed end 41L is fixed to a left standing portion 271L standing upright from the inner surface of the left side frame 27L by a fixing means, and the left side frame from the center of the front lateral supporting frame 262. It is slidably inserted into the through-hole 421L of the front left limit portion 42L standing upright on the 27L side, and protrudes toward the right side frame 27R. The front end of the front left regulation member 4L on the right side frame 27R side has a stopper 43L having a diameter larger than that of the through hole 421L.

The stopper 33R of the rear right regulating member 3R and the rear right restricting portion 32R that comes into contact therewith, the stopper 33L of the rear left regulating member 3L and the rear left restricting portion 32L that comes into contact therewith, the stopper 43R of the front right regulating member 4R and the front right that comes into contact therewith. The maximum vehicle width at which the distance between the right side frame 27R and the left side frame 27L is maximized is restricted by the restriction portion 42R, the stopper 43L of the front left restriction member 4L, and the front left restriction portion 42L that comes into contact with the stopper 43L.
In addition, by setting the hydraulic cylinder for expansion / contraction 263 to the minimum length, the minimum vehicle width is regulated.

[Piping structure of hydraulic hose]
The plurality of right hydraulic hoses 251R are connected to a joint of the swivel joint 25 on the right side frame 27R side from the left side frame 27L side. The plurality of left hydraulic hoses 251L are connected to a joint of the swivel joint 25 on the left side frame 27L side with respect to the right side frame 27R side. By arranging in this way, it is not necessary to make the hose longer than necessary, and there is no occurrence of bending in the hose path portion described later.

The right hose guide portion 5R extends from the tip of the stopper 33R of the rear right regulating member 3R, and moves right and left as the rear right regulating member 3R moves following the vehicle width expansion and contraction movement of the right side frame 27R. Move in the direction. The right hose guide portion 5R has a right opening 51R through which a plurality of right hydraulic hoses 251R are inserted (see an enlarged view of FIG. 3C).
The right opening 51R of the right hose guide portion 5R opens in the vehicle front-rear direction above the rear lateral support frame 261.
The left hose guide portion 5L extends from the distal end of the stopper 33L of the rear left regulating member 3L. The left hose guide portion 5L moves right and left as the rear left regulating member 3L moves following the vehicle width expanding and contracting movement of the left side frame 27L. Move in the direction. The left hose guide portion 5L has a left opening 51L through which a plurality of left hydraulic hoses 251L are inserted.
The left opening 51L of the left hose guide portion 5L opens in the vehicle front-rear direction above the rear lateral support frame 261.
In the present embodiment, the right and left

hose guide portions

5R and 5L have a rectangular ring shape, and the inside of the ring forms an opening.

The hose path section is divided into a substantially rectangular shape with the swivel joint 25 as a center, and is configured to have a short distance, preferably the shortest distance, toward the end point of the hydraulic hose.
The hose path portion has a front path space SF that guides the front hydraulic hose 253 from the swivel joint 25 to the blade cylinder 24 on the upper surface of the center frame 26.
The front path space SF has a front standing portion SF1 erected in the width direction along the front lateral support frame 262 ahead of the swivel joint 25. A plurality of front hydraulic hoses 253 are inserted into through holes provided in the front standing portion SF1.

The hose path portion includes a right path space SR on the upper surface of the center frame 26 that guides the right hydraulic hose 251R from the swivel joint 25 to the right hydraulic motor 22R, and a left path that guides the left hydraulic hose 251L from the swivel joint 25 to the left hydraulic motor 22L. And a space SL.
The right path space SR starts from the right side of the swivel joint 25, extends diagonally right and rearward to the rear lateral support frame 261, crosses the rear lateral support frame 261 and extends to the right side frame 27R; There is a second right standing portion SR2 extending along the shape of the first right standing portion SR1 by providing a space through which the hydraulic hose 251R passes.
The second right upright portion SR2 has a right rear guide portion 6R having a right rear opening 61R through which the right hydraulic hose 251R is inserted closer to the right hydraulic motor 22R than the right hose guide portion 5R (see an enlarged view of FIG. 3C). ).
The right rear opening 61 </ b> R opens in the vehicle front-rear direction above the rear lateral support frame 261.
The second right upright portion SR2 has a right front guide portion 7R having a right front opening 71R through which the right hydraulic hose 251R is inserted closer to the swivel joint 25 than the right hose guide portion 5R (see an enlarged view of FIG. 3C). .
The right front opening 71 </ b> R opens in the vehicle front-rear direction above the center frame 26.
In the present embodiment, the right front opening 71R has a U-shape, and the inside of the U forms an opening.

The left path space SL starts from the left side of the swivel joint 25, extends obliquely left rearward to the rear lateral support frame 261, intersects the rear lateral support frame 261 and extends to the left side frame 27L, and the left left standing portion SL1. There is a second left standing portion SL2 that extends along the shape of the first left standing portion SL1 by providing a space through which the hydraulic hose 251L passes.
The second left standing portion SL2 has a left rear guide portion 6L having a left rear opening 61L through which the left hydraulic hose 251L is inserted on the left hydraulic motor 22L side of the left hose guide portion 5L.
The left rear opening 61L opens in the vehicle front-rear direction above the rear lateral support frame 261.
The second left standing portion SL2 has a left front guide portion 7L having a left front opening 71L through which the left hydraulic hose 251L is inserted closer to the swivel joint 25 side than the left hose guide portion 5L.
The left front opening 71L opens in the vehicle front-rear direction above the center frame 26.
In the present embodiment, the left front opening 71L has a U shape, and the inside of the U shape forms an opening.

A right end opening 2721R is formed in the right frame end setting portion 272R of the right side frame 27R, and a plurality of right hydraulic hoses 251R are inserted therethrough.
A left end opening 2721L is formed in the left frame end setting portion 272L of the left side frame 27L, and a plurality of left hydraulic hoses 251L are inserted therethrough.

In the present embodiment, the opening centers of the right opening 51R and the right rear opening 61R are located at the same height from the center frame 26, and the opening center of the right front opening 71R is located at a position higher than them.
Further, the center of the left opening 51L and the center of the left rear opening 61L are located at the same height from the center frame 26, and the center of the opening of the left front opening 71L is at a position higher than them.

According to the above embodiment, in the minimum vehicle width and the maximum vehicle width, the plurality of left and right

hydraulic hoses

251L, 251R are inserted into at least the left and right

hose guide portions

5L, 5R, so that they can be freely bent without forcibly bending. Movement can be regulated. Further, by passing through the set hose route portion, the length of the hydraulic hose at the minimum vehicle width and the maximum vehicle width can be designed to be a necessary minimum.

[Another embodiment]
Although the present embodiment has been described with reference to the drawings, the specific configuration is not limited to these embodiments. This embodiment is shown not only by the description of the above-described embodiment but also by the claims, and further includes all modifications within the meaning and scope equivalent to the claims.

The center of each of the right opening, the right front opening, and the right rear opening may be at the same height position from the center frame, may be at different height positions, and may be at a lower position as being closer to the right hydraulic motor. It may be. The size of each opening may be the same or different.
The center of each of the left opening, the left front opening and the left rear opening may be at the same height position from the center frame, may be at a different height position, or may be at a lower position as being closer to the left hydraulic motor. Good. The size of each opening may be the same or different.

REFERENCE SIGNS LIST 1 backhoe 2 lower revolving superstructure 21R right crawler 21L left crawler 22R right traveling motor 22L left traveling motor 23 blade 24 blade cylinder 25 swivel joint 251R right hydraulic hose 251L left hydraulic hose 26 center frame 261 rear lateral support frame 261R rear right connecting portion 261L Rear left connecting portion 262 Front horizontal supporting frame 262R Front right connecting portion 262L Front left connecting portion 263 Hydraulic cylinder 27R for expansion and contraction Right side frame 27L Left side frame 271R Right standing portion 271L Left standing portion 272R Right frame leading end portion 2721R Right Tip opening 272L Left frame tip setting portion 2721L Left tip opening 3R Rear right regulating member 31R Fixed end 32R Rear right limiting portion 321R Through hole 33R Stopper 3 Rear left regulating member 31L Fixed end 32L Rear left restricting portion 321L Through hole 33L Stopper 4R Front right regulating member 4L Front left regulating member 5R Right hose guide 51R Right opening 5L Left hose guide 51L Left opening 6R Right rear guide 61R Right Rear opening 6L Left rear guide 61L Left rear opening 7R Right front guide 71R Right front opening 7L Left front guide 71L Left front opening 8 Work implement 81 Boom 81a Boom cylinder 82 Arm 82a Arm cylinder 83 Bucket 83a Bucket cylinder 91 Control section 92 Engine 93 Swivel table 94 Swivel motor SL Left path space SL1 First left standing part SL2 Second left standing part SR Right path space SR1 First right standing part SR2 Second right standing part

Claims

An upper revolving body, a work vehicle having a lower traveling body that rotatably supports the upper revolving body,
The lower traveling body is
A center frame on which a swivel joint to which one end of each of the right hydraulic hose and the left hydraulic hose is connected is suspended,
A right side frame to which a right running motor is mounted, to which the other end of the right hydraulic hose is connected, and a left running motor to which the other end of the left hydraulic hose is connected. The left side frame on which is mounted,
At least one right regulating member extending from the right side frame toward the left side frame, regulating a maximum vehicle width at which an interval between the right side frame and the left side frame is maximum; and At least one left regulating member extending from the side frame toward the right side frame;
A right hose guide portion having a right opening through which the right hydraulic hose is inserted, and provided in the right regulating member;
A work vehicle, comprising: a left opening through which the left hydraulic hose is inserted; and a left hose guide portion provided on the left regulating member.
The lower traveling body is
A rear lateral support frame provided on the rear upper surface of the center frame behind the swivel joint,
A rear right connecting portion extending from the right side frame toward the left side frame and slidably inserted on the right side of the rear lateral supporting frame; and a rear right connecting portion facing the rear right connecting portion; A rear left connecting portion extending from a side frame toward the right side frame and slidably inserted on the left side of the rear lateral support frame;
A front lateral support frame provided on a front upper surface of the center frame so as to be opposed to the rear lateral support frame with the swivel joint interposed therebetween,
A front right connecting portion extending from the right side frame toward the left side frame and slidably inserted into the right side of the front lateral support frame; and a front right connecting portion facing the front right connecting portion; The work vehicle according to claim 1, further comprising: a front left connecting portion extending from a side frame toward the right side frame and slidably inserted into a left side of the front lateral support frame.
The lower traveling body is
3. The work vehicle according to claim 2, further comprising a hose route portion having a space for guiding the right and left hydraulic hoses from the swivel joint to the right and left hydraulic motors on an upper surface of the center frame. 4.
The hose route portion includes a right rear guide portion having a right rear opening through which the right hydraulic hose is inserted closer to the right hydraulic motor side than the right hose guide portion, and / or the left rear portion relative to the left hose guide portion. 4. The work vehicle according to claim 2, further comprising a left rear guide portion having a left rear opening through which the left hydraulic hose is inserted on a hydraulic motor side. 5.
The hose route section has a right front guide section having a right front opening through which the right hydraulic hose is inserted closer to the swivel joint side than the right hose guide section, and / or the swivel joint is larger than the left hose guide section. The work vehicle according to any one of claims 2 to 4, further comprising a left front guide portion having a left front opening through which the left hydraulic hose is inserted.